ANTEC SLK2650-BQE tower 350 WATT Pentium 4 HT CPU P4 Titan 865PE mobo 40G Dell harddrive from old tower Dimension 4600C 1GB Kingston RAM upgrade from 512 dell standard I will start out by saying that I have not done any of the following.. I am only trying to help my hubby fix the computer before my credit card is maxed out from all the replacing! This all started out as a "simple" graphics card upgrade to be able to play BF2 (to the ATI Radeon..umm the red one with the fan) sorry no specs. didn't check the size before leaving store and tower would not close after installation. However it worked fine. Then needed/wanted a RAM upgrade. bought a 1gb Kingston card for tower, got home and realized that power supply was not sufficient, went back out and purchased Antec tower. worked for one day. and then went out and bought the mobo listed above. It ran a little after that but then just shut down. (this was while heatsink was just sitting on CPU w/o fan) DUH! Now system will not power on. Have replaced CPU the with intel listed above. Now all that happens is the continuous beeping on start up. Obviously this is a power issue but where should I begin? Taking tower back to store tonight hopefully will do something. Thankfully we have 2 comps but mine will not be a party to this madness! Any advice would be much appreciated!!!